CVE-2019-7743: Joomla/joomla cms Joomla! Object Injection Vulnerability Vulnerability

CRITICAL
Advisory Identifier: GHSA-5m3w-rvvh-8fx6
Share
CVSS 9.8
CWE-502
Published
Advisory Summary

CVE-2019-7743 is a CRITICAL (CVSS 9.8) joomla! object injection vulnerability vulnerability (CWE-502: Deserialization of Untrusted Data) affecting Joomla/joomla cms libraries in the Packagist ecosystem. The issue involves joomla! object injection vulnerability. Remediation is available by upgrading affected packages to version 3.9.3.

CVE-2019-7743 at a Glance

CVE Identifier CVE-2019-7743
GHSA Identifier GHSA-5m3w-rvvh-8fx6
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-502: Deserialization of Untrusted Data
Affected Product Joomla/joomla cms
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 9.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2019-7743

To remediate this vulnerability, upgrade all affected Joomla/joomla cms dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

joomla/joomla-cms fixed: 3.9.3 
Upgrade joomla/joomla-cms to 3.9.3
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for joomla/joomla-cms

How to Check if You Are Affected

To determine whether your application is affected by CVE-2019-7743, inspect your project dependencies for Joomla/joomla cms:

inspect dependencies for joomla/joomla-cms

Analyze the terminal output to locate any version of Joomla/joomla cms in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.9.3), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-502: Deserialization of Untrusted Data, where the product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid. In Joomla/joomla cms, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

An issue was discovered in Joomla! before 3.9.3. The phar:// stream wrapper can be used for object injection attacks because there is no protection mechanism (such as the TYPO3 PHAR stream wrapper) to prevent use of the phar:// handler for non .phar-files.

CVE-2019-7743 Affected Joomla/joomla cms Versions

1 component(s)
Fixed Versions:
3.9.3
Product / Package Ecosystem Affected Versions Fixed Version
joomla/joomla-cms
 Packagist
≥ 2.5.0
< 3.9.3
3.9.3

References

NVD — CVE-2019-7743 NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-7743
Joomla/joomla cms Source Repository REPOSITORY
https://github.com/joomla/joomla-cms/issues/23907
Joomla/joomla cms Security Information SECURITY
https://developer.joomla.org/security-centre/770-20190206-core-implement-the-typo3-phar-stream-wrapper
Joomla/joomla cms Source Repository REPOSITORY
https://github.com/joomla/joomla-cms
Joomla/joomla cms Security Information SECURITY
https://web.archive.org/web/20210730211655/https://www.securityfocus.com/bid/107050

Frequently Asked Questions

What is CVE-2019-7743?
CVE-2019-7743 is a security vulnerability in Joomla/joomla cms involving Joomla! Object Injection Vulnerability under CWE-502: Deserialization of Untrusted Data.
Which Joomla/joomla cms versions are affected?
Affected versions include releases prior to 3.9.3 across affected packages: joomla/joomla-cms.
What version fixes CVE-2019-7743?
Upgrading to 3.9.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is joomla/joomla-cms affected?
Yes, joomla/joomla-cms is affected in releases prior to 3.9.3. Upgrade your dependency to 3.9.3 or later.
What is the CVSS score of CVE-2019-7743?
CVE-2019-7743 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2019-7743?
CVE-2019-7743 is classified under CWE-502: Deserialization of Untrusted Data (The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.).
How can I check Packagist dependencies for CVE-2019-7743?
Run the dependency tree command: 'inspect dependencies for joomla/joomla-cms'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-5m3w-rvvh-8fx6",
  "modified" : "2023-09-28T20:28:22Z",
  "published" : "2022-05-13T01:22:55Z",
  "aliases" : [ "CVE-2019-7743" ],
  "summary" : "Joomla! Object Injection Vulnerability",
  "details" : "An issue was discovered in Joomla! before 3.9.3. The phar:// stream wrapper can be used for object injection attacks because there is no protection mechanism (such as the TYPO3 PHAR stream wrapper) to prevent use of the phar:// handler for non .phar-files.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "joomla/joomla-cms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.5.0"
      }, {
        "fixed" : "3.9.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2019-7743"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/joomla/joomla-cms/issues/23907"
  }, {
    "type" : "WEB",
    "url" : "https://developer.joomla.org/security-centre/770-20190206-core-implement-the-typo3-phar-stream-wrapper"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/joomla/joomla-cms"
  }, {
    "type" : "WEB",
    "url" : "https://web.archive.org/web/20210730211655/https://www.securityfocus.com/bid/107050"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-502" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-07-19T18:33:32Z",
    "nvd_published_at" : "2019-02-12T18:29:00Z"
  }
}